Manganese phosphate fertilizer



Patented Qct. 19, 1937 I f v 2,095,993 I UNITEDSTATES PATENT OFFICE 2,095,993 MANGANESE PHOSPHATE FERTILIZER Walter H. MacIntire, Knoxville, Tenn.

No Drawing. Application June 22, 1935, Serial No. 28,023

3 Claims. (01. 71-2) (Granted under the act of March 3, 1883,-as amended April 30, 1928; 370 0. G. 757) This application is made under the act of April I have produced a new fertilizer composition, 30, 1928, and the invention herein described, if for use on those soils that require manganese as patented, may be manufactured and used by or an essential fertilizer element, by incorporating for the Government for governmental purposes an without the payment to me of any royalty cial superphosphates or by making a superphosthereon. This invention relates to fertilizer composiavailable manganese phosphate. tions containing manganese in a formavailable One example is given to show the operation as plant food.

10 One of the objects of this invention is to prophosphoric. c d are add d t 5 parts by duce a fertilizer composition which contains weight of -rhodochrosite of less than 300 mesh, more than one essential element of plant food, ontaining 84.3% MnCOs, 8.91 MgCQs, 3.57% one of which is manganese. Another object of CaCOa, 2.06% F6203 and A1203 and 0.65% 8102, this invention is to produce a fertilizer composiare added and the mixture vigorously agitated crops, especially tobacco. Other objects .of this partially reacted material mixed with the unreg0 invention include the production of fertilizer acted rhodochrosite and concentrated phosphoric 2O composition, containing more than one element acid impregnated with carbon dioxide. This gasof plant food, in which the manganese present is distended body collapses in sixteen hours or less in a soluble form.

Concentrated superphosphates, usually called ganese phosphate and some undecomposed rhotriple superphosphates, have been made from dochrosite and some free phosphoric acid. Upon 25 dolomite, limestone and phosphate rock, by refurther standing the mixture gradually becomes action of these materials with phosphoric acid, a mass of damp crystals resembling a correby a variety of processes. One of the oldest sponding bulk of magnesium chloride. At the methods for preparing s'uperphosphates is by end'of a curing period of three weeks there is the treatment of phosphate rock with sulfuric obtained 900 partsvby weight of a. slightly hyacid. However, any, phosphate which contains a groscopic mixture consisting substantially of substantial proportion'of phosphorus in a form crystalline mono-manganese phosphate. This available as plant food and which is a proper mono-manganesephdsphate is mixed with equal fertilizer composition may be properly termed a parts by weight of triple superphos'phate to form superphosphate. Soils requiring a manganese a manganese phosphate composition very rich in 35 supplement to one or more of the commonly conwater-soluble manganese. sidered essential elements of plant food have had Another example is given to show the operthis supplement supplied, in most instances, by ation of my invention. A uniform mixture of 203 the addition of the required quantity of mangaparts by Weight of brown Tennessee phosphate 40 nese sulfate, which is not advantageous for aprock, containing 76.2% CaaiPOQz equivalent and 40 plication in connection with certain types of 37.8 parts by weight of rhodochrosite of less than crops, 325 mesh, containing 84.3 MnCOs, 8.9% MgCOa, In my co-pending application, Ser. No. 28,025, with 324.3 parts by weight of phosphoric acid filed June 22, 1935, Making manganese phosphate, containing 75% H3PO4. The granular mixture I have described and claimed the process of makresulting is cured for three weeks and a product 45 ing a soluble manganese salt which may be used of 534 parts by. weight of a manganese containing in place of the manganese sulfate without the triple superphosphate is obtained. This triple undesirable efiects produced by the latter. superphosphate contains 3.2% water-soluble In my co-pending application, Ser. No. 28,024, manganese, calculated as Mn3O4, which is equivfiled June 22, 1935, Making manganese phosphate alent to 12% manganese phosphate. 50

fertilizer, I have described and claimed the proc- It is evident that there are nume"ous factors ess of making a phosphatic fertilizer which may which will influence conditions for the most satbe used in place of combining the use of superisfactory production and use of the compositions phosphates and manganese sulfate without the covered by this invention, the actual limits of undesirable effects producedby the latter. which cannot be established except by detailed 55 2 study of each set. of raw materials and finished products involved. Superphosphate means and includes any phosphatic fertilizer containing at least 16% P205 equivalent available as plant food. Available manganese phosphate means and includes any manganese phosphate in which the,

manganese is available as plant food, such as mono-manganese phosphate, MnH4(PO4) 2.21-120, di-manganese phosphate, MnHPO4.3HzO, and ammonium manganese phosphate,

desired to supply a small manganese supplement; along with the usual application of those fertilizer elements which are more commonly considered essential to plant growth.

It will be seen, therefore, that this invention actually may be carried out with the modification of certain details without departing from its spirit or scope.

I claim:

1. A fertilizer containing manganese as an essential element, which comprises a superphosphate, and mono-manganese phosphate.

2. A fertilizer containing manganese as an essential element, which comprises a superphosphate, and ammonium manganese phosphate.

3. A superphosphate fertilizer containing manganese as an essential element in the form of an available manganese phosphate.

WALTER H. MACINTIRE. 

